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Valve help

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Vincenzo » Wed Jan 05, 2011 5:49 pm

What kind of machinery do you have access to?
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: nadjatee1996 » Wed Jan 05, 2011 8:53 pm

A dremel, a jigsaw, a power drill, a wireless drill and I think my dad still got his old Grinder thing
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Unread postAuthor: Vincenzo » Wed Jan 05, 2011 9:34 pm

Then I think you'll have a hard time. :)
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: FighterAce » Wed Jan 05, 2011 10:23 pm

nadjatee1996 wrote:A dremel, a jigsaw, a power drill, a wireless drill and I think my dad still got his old Grinder thing


You have more tools then I do... but you forgot to name one thing.... your Hands! :D
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Unread postAuthor: Gaderelguitarist » Thu Jan 06, 2011 12:23 am

And your brain.

Brains are a necessity to this hobby. You can manage a lot of JSR's builds with that much hardware I believe. He focuses on two part epoxy casting. It would definitely be something to look into for your build as it doesn't rely on cumbersome fittings. The dremel is a very versatile tool.

Blowguns only cost about 5 dollars. Most high schoolers have that kind of coin (at least I did). It would be smart to simplify your build as much as possible. Keep it simple, do it well, and it will work.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 06, 2011 12:39 am

Gaderelguitarist wrote:You can manage a lot of JSR's builds with that much hardware I believe. He focuses on two part epoxy casting. It would definitely be something to look into for your build as it doesn't rely on cumbersome fittings. The dremel is a very versatile tool.


Hear hear, my basic tools are a power drill, vice, files and hacksaw. Epoxy adhesive is a big plus when you don't have access to equipment that can work stronger materials, plenty of information here and here.

Also, why a hammer valve design? There are simpler and more efficient options, such as the valveless/pop-off concept. Here's an example of what it might look like:

Image
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Unread postAuthor: Gaderelguitarist » Thu Jan 06, 2011 10:42 am

He was suggested a hammer valve in the first place. All he's looking for is a compact valve that can be built into a pistol.

Couldn't one use a weaker spring to make that set up effectually semi auto? A priming slide sould mount on the top to load the first shot, the pressure behind the round would then force back the loading piston. I suppose it would need relatively high pressures, as well as a lot of tweaking.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 06, 2011 11:49 am

Gaderelguitarist wrote:.Couldn't one use a weaker spring to make that set up effectually semi auto? A priming slide sould mount on the top to load the first shot, the pressure behind the round would then force back the loading piston. I suppose it would need relatively high pressures, as well as a lot of tweaking.


That was the original idea but I couldn't get to function at compressor pressures
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Unread postAuthor: nadjatee1996 » Thu Jan 06, 2011 4:08 pm

I like JSR's concept, but instead of having the magazine on the bottom, I'm going to mod it so it goes on top, any ideas on materials and where I can find a blow gun trigger?Also, while at school today, I was inspired by something I saw, more on that later xD


Also, whats the dots on the barrel?
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Unread postAuthor: Vincenzo » Thu Jan 06, 2011 5:05 pm

nadjatee1996 wrote:Any ideas on materials and where I can find a blow gun trigger? Also, whats the dots on the barrel?

If you go by this design, most of it will be epoxy casting and plastic pipe. The blowgun can be bought at a home improvement store. The "dots" on the barrel represent the "detent". It is the part that holds the projectile back until enough pressure is achieved to force it through and out the barrel. I'm sure JSR will be happy to help you on that.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: nadjatee1996 » Thu Jan 06, 2011 6:01 pm

I live in NYC, unless it Home Depot, I dunno where theres another home improvement store, AND, I don;t even have a car
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Unread postAuthor: Vincenzo » Thu Jan 06, 2011 6:22 pm

Yeah, you can get them at Home Depot.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: nadjatee1996 » Thu Jan 06, 2011 10:38 pm

No car..lol and parents would never drive me there
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Unread postAuthor: Gaderelguitarist » Fri Jan 07, 2011 1:15 am

The great things about legs is that sometimes they can take you places.

compressor pressures


But you have an HPA tank...
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 07, 2011 2:58 am

Vincenzo wrote:If you go by this design, most of it will be epoxy casting and plastic pipe. The blowgun can be bought at a home improvement store. The "dots" on the barrel represent the "detent". It is the part that holds the projectile back until enough pressure is achieved to force it through and out the barrel.


Here's what it looked like in real life, before pouring the epoxy:

Image

The "dots" represent the o-rings, which are retained around a mandrel while epoxy sets.

But you have an HPA tank...


Yes, but I was trying to make something anyone could use. The valveless cartridge prototype I made uses essentially the same concept as the above design, and worked perfectly at 800 psi.

Image
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